Form grinding machine



Nov. 7, 1939. c, BOOTH 2.178.848-

FORM GRINDING MACHINE Filed July 16, 1937 2 Sheets-Sheet l FIG. 1

INVENTOR. CLEMENT 500 TH BY WZQWM.

ATTORNEY.

Patented Nov. 7, 1939 PATENT FORM GRINDING MACHINE Clement Booth,Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated,Cincinnati, Ohio, a corporation of Ohio Application July 16, 1937,Serial No. 154,031

9 Claims.

This invention relates to grinding machines and more particularly toimprovements in a form grinding machine.

The chief object of this invention is to provide an improved simplifiedand inexpensive structure for performing form grinding operations.

Other objects and advantagesof the present invention should be readilyapparent by reference to the following specification, considered inconjunction with the accompanying drawings forming a part thereof and itis to be understood that any modifications may be made in the exactstructural details there shown and described, within the scope of theappended claims, without departing from or exceeding the spirit of theinvention.

Referring to the drawings in which like reference numerals indicate likeor similar parts:

Figure 1 is an elevation of a grinding machine embodying the principlesof this invention.

Figure 2 is a plan View of the work table.

Figure 3 is a section on the line 3'3 of Figure 2.

Figure 4 is a detail View of the control cam as viewed on the line 4-4of Figure 3.

Referring to Figure l of the drawings, the reference numeral tilindicates the bed of a grinding machine upon the top of which is formeda V-guideway l l and a flat guideway !2, as more particularly shown inFigure 3. A table l3 has correspondingly formed parts M and 15 forcooperation with these guideways whereby the table is supported forlongitudinal movement and held against lateral movement.

The machine is provided with a grinding wheel it which is movable byconventional mechanism not shown, but terminating in the hand wheel ll,toward and from the work table for engagement or disengagement with thework, and while engaging with the work the table is reciprocated byconventional mechanism such as the power driven pinion i'l interrneshingwith the rack l8 fixed to the underside of the table.

The table 53 has a plain top in which is formed a pair of longitudinallyextending T-slots it; A mechanism is detachably mounted on the top ofthis table for supporting a work piece for lateral movement in asubstantially radial direction with respect to the grinding wheel,whereby form grinding operations may be easily and accurately performed.This mechanism comprises a base plate i9 which is secured to the tableat a number of points by .T-bolts 2t mounted in the T- slots is andpassing through suitably drilled holes in the plate. The plate has apair of bearings 2! formed at opposite ends thereof by means of which acarrier 22 may be trunnioned for oscillating the work toward and fromthe grinding wheel. The carrier 22 has journal portions 23 projectingfrom opposite ends thereof by which the carrier is supported in thebearings 2i.

From Figure 3 it will be noted that the center line 24 of these bearingslies in a vertical plane 25 which passes through the center of the V-guideway I4.

The carrier has inclined guideways 26 and 21 for supporting a headstock28 and a tailstock 29 for adjustment toward and from one another inaccordance with usual practice. The headstock carries a motor 33 whichis connected by a power transmitting band 3| for rotation of theheadstock spindle 32 which carries a face plate 33 and the usual livecenter 34. The tailstock carries a spindle 35 which is longitudinallymovable by a lever 36 and is adapted to be locked in position by a lever31. The spindle carries a dead center 38 which is engageable with oneend of the work piece. It will now be seen that the headstock andtailstock and the power means for rotating the Work are all carried bythe carrier.

The carrier is continuously urged in a clockwise direction about thecenter of the trunnions by means of springs 39 contained in housings ii!integral with the carrier and acting on headed plungers 4| which bear onbosses 32 formed integral with the base plate W. This clockwise movementis controlled, however, by a cam which controls the form or shape of thework piece. The cam plate 43 is secured to a bracket Ml by means ofbolts 45, the bracket in turn being integral with the bed ill. The cami3 is, of course, removable so that other cams of varying contours maybe substituted therefor. The cam is solaid out that the mean diameterline it will lie in a horizontal plane ll, passing through the centerline 24 of the bearings 25 and perpendicular to the plane 25. Thisequalizes the movement of the center line of the work to each side ofthe vertical plane 25 so that the work moves substantially in a radialplane with respect to the axis of the grinding wheel. It also insureskeeping the weight of the work as near as possible in a vertical planepassing. through the axes of the trunnions and thereby prevents the deadweight of the work from coming on the springs 39 or on the control cam43.

The carrier is providedwith a follower 28 which is attached thereto asby a clamping bolt Ali) and this follower has a very narrow edge whichrides on the surface of the control cam as more particularly shown inFigure 4. This shape is desirable in order to prevent interference whenthe shape of the cam becomes complicated. Attention is also invented tothe fact that the periphery of the grinding wheel l6 has a roundedcontour so as to: prevent interference and insure accurate reproductionof the desired shape or form to be imparted to the work.

To assist in replacing the cams there is provided a stop member 52 whichis threaded in the base plate I!) and passes through an opening 53 inthe carrier. A nut 54 is threaded on this stop member in engagement witha dish-shaped washer 55 which engages the carrier whereby upon rotationof the nut 54 in one direction the carrier may be moved in acounterclockwise direction, compressing the spring 39 and relieving theload on the cam, whereby the same may be removed for replacementpurposes.

There has thus been provided a form grinding machine having improvedsimplified and compact mechanism for supporting a work piece for lateralmovement during rotation thereof with respect to a grinding wheelwhereby predetermined contours may be imparted thereto.

I claim:

1. A grinding machine having a bed, a grinding wheel rotatably supportedthereon, a V-guideway formed longitudinally of the bed, a slidereciprocably mounted on the bed and having a V-shaped portioncooperating with said guideway, an oscillatable carrier mounted on saidslide, trunnions for supporting said carrier and located in a verticalplane passing through the center of said V- guideway, a headstock andtailstock mounted on said carrier and having work supporting centerslocated in said vertical plane, and means operable by relativereciprocation of the slide and bed for oscillating said carrier andthereby said centers to opposite sides of said vertical plane for movinga work piece toward and from the grinding wheel to determine thelongitudinal profile of the work piece during rotation and translationthereof.

2. A grinding machine having a grinding wheel and a reciprocable slidemovable transversely thereof, the combination of means for supporting awork piece for oscillatory movement relative to the grinding wheelincluding a swinging carrier, trunnions for supporting the carrier onthe slide, means normally urging the carrier in one direction about saidtrunnions, a headstock and tailstock having centers for supporting awork piece on the carrier with the axis of the mean diameter of the worklying in a vertical plane passing through the axes of said trunnions,and interengaging means on the machine and on the carrier activated bytransverse movement of the slide to control oscillation of the work toone side or the other of said vertical plane to increase or decrease thediameter of the work while the same is being translated by said slide.

3. A grinding machine having a grinding wheel and a reciprocable slidemovable transversely thereof, the combination of a carrier mounted foroscillation on said slide, means self-contained in the carrier forsupporting and power rotating a work piece, the axis of oscillation ofthe carrier and the axis of the supporting means for the work extendingparallel to each other in a conmon vertical plane, resiliently operablemeans for moving the carrier and thereby the work about the axis of thecarrier toward the grinding wheel, a cam mounted on the bed, and afollower integral with the carrier and. riding along said cam duringtransverse movement of the slide for controlling oscillation of thecarrier and thereby the movement of the work toward and from thegrinding wheel.

4. A grinding machine having a grinding wheel and a reciprocable slidemovable transversely thereof, the combination of a carrier rotatablymounted on the slide for movement about an axis extending parallel tothe direction of movement of the slide, means self-contained in thecarrier for supporting and power rotating a work piece, the axis ofrotation of the carrier and of the work supporting means lying in acommon vertical plane, resiliently operable means located on one side ofsaid plane for urging the carrier in one direction about its axis ofrotation, cam means located on the other side of said plane forpositively controlling movement of the carrier and thereby of the worktoward and from the grinding wheel, and additional means located on oneside of said plane for positively limiting the rotative movement of thecarrier caused by said resiliently operable means.

5. An attachment for a grinding machine of the type including a bedhaving a work supporting table and a grinding wheel mounted thereon forrelative traversing movement, said attachment including a base adaptedto be secured to the table, an auxiliary work support pivoted to thebase for oscillation about an axis extending parallel with that of thegrinding wheel, means on the work support for rotatably supporting awork piece for rotation about an axis parallel with said pivot, meansfor resiliently urging said work supporting means about its pivotalsupport, and control means including a first element fixed with respectto the attachment and a second element fixed with respect to thegrinding wheel, one of said elements being contoured in accordance withthe profile to be reproduced on the work piece whereby said controlmeans variably determines the relative position of the axes of the workand grinding wheel during relative traverse of said parts and thus theprofile produced by the grinding wheel on the work during such traverse.

6. An attachment for a grinding machine of the type including a bedhaving a work supporting table and a grinding wheel mounted thereon forrelative traversing movement, said attach ment including a base adaptedto be secured to the table, an auxiliary work support pivoted to thebase for oscillation about an axis extending parallel with that of thegrinding wheel, means on the work support for rotatably supporting awork piece for rotation about an axis parallel with said pivot, meansfor resiliently urging said work supporting means about its pivotalsupport, control means including a first element fixed with respect tothe attachment and a second element fixed with respect to the grindingwheel, one of said elements being contoured in accordance with theprofile to be reproduced on the work piece whereby said control meansvariably determines the relative position of the axes of the work andgrinding wheel during relative traverse of said parts and thus theprofile produced by the grinding wheel on the work during such traverse,and means for adjustably limiting thev movement of the work holdingmeans opposing and limiting the resilient actuation thereof.

'7 A machine for producing variable profiles on a cylindrical workpiece, said machine including a bed or support, a grinding wheel mountedthereon for rotation about a predetermined axis,

in opposition to the grinding wheel, means for effecting relativetraversing movement of said parts in a direction parallel with the aXisof said grinding wheel, a work supporting member mounted on the table,said supporting member having work engaging members adapted rotatably tosupport a work piece with its axis of rotation parallel with that of thegrinding wheel, means pivotally connecting the work support and tablefor oscillation about an axis parallel with that established by the worksupporting members whereby the work may be moved in a direction towardand from the grinding wheel, said grinding wheel having a peripherallycrowned face to conform with the varying contours to be produced on thework piece, and means including relatively traversable pattern andfollower members one of which is fixed with respect to the grindingwheel and the other with respect to the work support, whereby saidmembers traverse each other on relative movement of said parts in anaxial direction to determine the movement of the work supporting memberabout its pivotal mounting and thus the relative approach and retractionof the axes of the work and grinding wheel.

8. An attachment for the performance of cambering or like operations ona grinding machine of the type embodying a support, a grinding wheel andmeans for eifecting relative translation of said parts, said attachmentincluding a base plate adapted to be secured on a separate element ofthe grinding machine and having spaced aligned bearing portions, anoscillatable work supporting member having trunnion portionsinterengaged with the bearings whereby the work supporting member ismounted on the plate for oscillation with respect thereto about an axisdetermined by said spaced bearings, a spring housing mounted on the worksupporting member, a stud carried by the plate having an enlargedterminal portion slidable in the housing and engageable with the housingfor limiting relative movement of the work support and plate in onedirection, a spring within the housing having one end thereof engagingthe enlarged terminal portion of the stud, and an abutment membercarried by the housing and engaging the opposite end of the springwhereby the latter reacts through the stud on the plate to effect aunidirectional urge of the work support about its trunnion mounting, anadditional stud member interengaged with the work support and the plate,and an adjustable abutment device carried by said stud and engaging thework support for variably determining the extent of movement thereofeffectible by the spring. I

9. An attachment for the performance of cambering or like operations ona grinding machine of the type embodying a support, a grinding wheel andmeans for effecting relative translation of said parts, said attachmentincluding a base plate adapted to be secured on a separate element ofthe grinding machine and having spaced" aligned bearing portions, anoscillatable work supporting member having trunnion portionsinterengaged with the bearings whereby the work supporting member ismounted on the plate for oscillation with re pect thereto about an axisdetermined by said spaced bearings, a springhousing mounted on the worksupporting member, a stud carried by the plate having an enlargedterminal portion slidable in the housing'and engageable With the housingfor limiting relative movement of the work support and plate in onedirection, a spring within the housing having one end thereof engagingthe enlarged terminal portion of the stud, and an abutment membercarried by the housing and engaging the opposite end of the springwhereby the latter reacts through the stud on the plate to effect aunidirectional urge of the work support about its trunnion mounting, anadditional stud member interengaged with the work support and the plate,an adjustable abutment device carried by said stud and en'- ga-ging thework support for variably determining the extent of movement thereofeifectible by the spring, a cam member and a follower for variablyshifting the work support about its trunnion within the limitsdetermined by the adjustable abutment on the last-mentioned stud, one ofsaid parts being adapted to be secured to the grinding machine and thetrunnioned work support having a bracket portion positioned to supportthe other of said parts in cooperative relation with the part on thegrinding machine, substantially as and for the purpose described.

CLEMENT BOOTH.

